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Finding the Fourth Proportional to 440,640, 608,083.20 and 239,436

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Solution

The fourth proportional to 440,640, 608,083.20 and 239,436 is: 330,421.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    440,640 : 608,083.20 = 239,436 : x
  2. Step 2: Convert to fraction form
    440,640/608,083.20 = 239,436/x
  3. Step 3: Cross multiply
    440,640x = 608,083.20 × 239,436
  4. Step 4: Simplify right side
    440,640x = 145,597,009,075.20
  5. Step 5: Solve for x
    x = 145,597,009,075.20/440,640
  6. Step 6: Final answer
    x = 330,421.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.